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在1987年的防治工作中,我们为了掌握麦红吸浆虫的防治适期,对其越冬幼虫在土壤中上升、化蛹及成虫羽化时间进行了观测,结果如下。 1.幼虫的上升:从小麦拔节期开始,选田3块,每块随机取3个样方,每样方10×10×20厘米。每8天分层淘土1次,每层深7厘米。统计各层幼虫数和休眠体之比,结果得出,随着时间的推
In order to control the suitable stage of control of Myzus persicae in the prevention and control work in 1987, we observed the emergence of overwintering larvae in the soil, the emergence time of pupation and adults, and the results are as follows. 1 larvae rise: from the beginning of the wheat jointing period, the election field 3, each randomly selected 3 quadrats, each party 10 × 10 × 20 cm. Amoy 1 layer every 8 days, each layer 7 cm deep. Statistical larval number of layers and the ratio of resting body, the results obtained, as time goes by